/*
Copyright (C) 1996-1997 Id Software, Inc.

This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.

*/
// cvar.c -- dynamic variable tracking

#include "quakedef.h"

cvar_t	*cvar_vars;
char	*cvar_null_string = "";

/*
============
Cvar_FindVar
============
*/
cvar_t *Cvar_FindVar (char *var_name)
{
    cvar_t	*var;

    for (var=cvar_vars ; var ; var=var->next)
    {
        if (!Q_strcmp (var_name, var->name))
        {
            return var;
        }
    }
    return NULL;
}

/*
============
Cvar_VariableValue
============
*/
float Cvar_VariableValue (char *var_name)
{
    cvar_t	*var;

    var = Cvar_FindVar (var_name);

    if (!var)
    {
        return 0;
    }
    return Q_atof (var->string);
}


/*
============
Cvar_VariableString
============
*/
char *Cvar_VariableString (char *var_name)
{
    cvar_t *var;

    var = Cvar_FindVar (var_name);

    if (!var)
    {
        return cvar_null_string;
    }
    return var->string;
}


/*
============
Cvar_CompleteVariable
============
*/
char *Cvar_CompleteVariable (char *partial)
{
    cvar_t		*cvar;
    int			len;

    len = Q_strlen(partial);

    if (!len)
    {
        return NULL;
    }

// check functions
    for (cvar=cvar_vars ; cvar ; cvar=cvar->next)
    {
        if (!Q_strncmp (partial,cvar->name, len))
        {
            return cvar->name;
        }
    }
    return NULL;
}

/*
============
Cvar_CompleteCountPossible
============
*/
int Cvar_CompleteCountPossible (char *partial)
{
    cvar_t	*cvar;
    int	    len;
    int	    h;

    h = 0;

    len = Q_strlen(partial);

    if (!len)
    {
        return 0;
    }

    // Loop through the cvars and count all partial matches
    for (cvar=cvar_vars ; cvar ; cvar=cvar->next)
    {
        if (!Q_strncmp (partial,cvar->name, len))
        {
            h++;
        }
    }
    return h;
}

/*
============
Cvar_CompletePrintPossible
============
*/
void Cvar_CompletePrintPossible (char *partial)
{
    cvar_t	*cvar;
    int	    len;
    int	    lpos;
    int	    out;
    int	    con_linewidth;
    char	sout[32];
    char	lout[2048];

    len = Q_strlen(partial);
    lpos = 0;
    Q_strcpy(lout,"");

    // Determine the width of the console
    con_linewidth = (vid.width >> 3) - 3;

    // Loop through the cvars and print all matches
    for (cvar=cvar_vars ; cvar ; cvar=cvar->next)
    {
        if (!Q_strncmp (partial,cvar->name, len))
        {
            Q_strcpy(sout, cvar->name);
            out = Q_strlen(sout);
            lpos += out;

            // Pad with spaces
            for (/**/; out < 20; out++)
            {
                if (lpos < con_linewidth)
                {
                    Q_strcat (sout, " ");
                }
                lpos++;
            }
            Q_strcat (lout, sout);

            if (lpos > con_linewidth - 24)
            {
                for  (/**/; lpos < con_linewidth; lpos++)
                {
                    Q_strcat(lout, " ");
                }
            }

            if (lpos >= con_linewidth)
            {
                lpos = 0;
            }
        }
    }
    Con_Printf ("%s\n\n", lout);
}

/*
============
Cvar_Reset -- johnfitz
============
*/
void Cvar_Reset (char *name)
{
	cvar_t	*var;

	var = Cvar_FindVar (name);

	if (!var)
    {
		Con_Printf ("variable \"%s\" not found\n", name);
	}
	else
    {
		Cvar_Set (var->name, var->default_string);
	}
}

/*
============
Cvar_Set
============
*/
void Cvar_Set (char *var_name, char *value)
{
	cvar_t	*var;
	qboolean changed;

	var = Cvar_FindVar (var_name);

	if (!var)
	{	// there is an error in C code if this happens
		Con_Printf ("Cvar_Set: variable %s not found\n", var_name);
		return;
	}
	changed = Q_strcmp(var->string, value);

	Z_Free (var->string);	// free the old value string
	var->string = Z_Malloc (Q_strlen(value)+1);
	Q_strcpy (var->string, value);
	var->value = Q_atof (var->string);

	//johnfitz -- during initialization, update default too
	if (!host_initialized)
	{
		Z_Free (var->default_string);
		var->default_string = Z_Malloc (Q_strlen(value)+1);
		Q_strcpy (var->default_string, value);
	}
	//johnfitz

	if (var->server && changed)
	{
		if (sv.active)
        {
			SV_BroadcastPrintf ("\"%s\" changed to \"%s\"\n", var->name, var->string);
		}
	}

	//johnfitz
	if(var->callback && changed)
    {
		var->callback();
	}
	//johnfitz
}

/*
============
Cvar_SetValue
============
*/
void Cvar_SetValue (char *var_name, float value)
{
    char	val[32];

    if (value == (int)value) //decimal fix - Eradicator
        sprintf (val, "%d", (int)value);
    else
        sprintf (val, "%f",value);

    Cvar_Set (var_name, val);
}


/*
============
Cvar_RegisterVariable

Adds a freestanding variable to the variable list.
============
*/
void Cvar_RegisterVariable (cvar_t *variable, void *function)
{
	char	*oldstr;
	cvar_t	*cursor, *prev; //johnfitz -- sorted list insert

// first check to see if it has allready been defined
	if (Cvar_FindVar (variable->name))
	{
		Con_Printf ("Can't register variable %s, allready defined\n", variable->name);
		return;
	}

// check for overlap with a command
	if (Cmd_Exists (variable->name))
	{
		Con_Printf ("Cvar_RegisterVariable: %s is a command\n", variable->name);
		return;
	}

// copy the value off, because future sets will Z_Free it
	oldstr = variable->string;
	variable->string = Z_Malloc (Q_strlen(variable->string)+1);
	Q_strcpy (variable->string, oldstr);
	variable->value = Q_atof (variable->string);

	//johnfitz -- save initial value for "reset" command
	variable->default_string = Z_Malloc (Q_strlen(variable->string)+1);
	Q_strcpy (variable->default_string, oldstr);
	//johnfitz

// link the variable in

	//johnfitz -- insert each entry in alphabetical order
    if (cvar_vars == NULL || strcmp(variable->name, cvar_vars->name) < 0) //insert at front
	{
        variable->next = cvar_vars;
        cvar_vars = variable;
    }
    else //insert later
	{
        prev = cvar_vars;
        cursor = cvar_vars->next;

        while (cursor && (strcmp(variable->name, cursor->name) > 0))
		{
            prev = cursor;
            cursor = cursor->next;
        }
        variable->next = prev->next;
        prev->next = variable;
    }
	//johnfitz

	variable->callback = function; //johnfitz
}

/*
============
Cvar_Command

Handles variable inspection and changing from the console
============
*/
qboolean Cvar_Command (void)
{
    cvar_t			*v;

// check variables
    v = Cvar_FindVar (Cmd_Argv(0));

    if (!v)
    {
        return false;
    }

// perform a variable print or set
    if (Cmd_Argc() == 1)
    {
        Con_Printf ("\"%s\" is \"%s\"\n", v->name, v->string);
        return true;
    }
    Cvar_Set (v->name, Cmd_Argv(1));
    return true;
}


/*
============
Cvar_WriteVariables

Writes lines containing "set variable value" for all variables
with the archive flag set to true.
============
*/
void Cvar_WriteVariables (FILE *f)
{
    cvar_t	*var;

    for (var = cvar_vars ; var ; var = var->next)
    {
        if (var->archive)
        {
            fprintf (f, "%s \"%s\"\n", var->name, var->string);
        }
    }
}

/*
=========
Cvar_List

Displays a list of all cvars similar to Quake3 cvarlist - Eradicator
=========
*/
void Cvar_List_f (void)
{
    cvar_t		*cvar;
    char 		*partial;
    int		len;
    int		count;

    if (Cmd_Argc() > 1)
    {
        partial = Cmd_Argv (1);
        len = Q_strlen(partial);
    }
    else
    {
        partial = NULL;
        len = 0;
    }
    count=0;

    for (cvar=cvar_vars ; cvar ; cvar=cvar->next)
    {
        if (partial && Q_strncmp (partial,cvar->name, len))
        {
            continue;
        }
        Con_Printf ("\"%s\" is \"%s\"\n", cvar->name, cvar->string);
        count++;
    }
    Con_Printf ("%i cvar(s)", count);

    if (partial)
    {
        Con_Printf (" beginning with \"%s\"", partial);
    }
    Con_Printf ("\n");
}

/*
============
Cvar_Reset_f -- johnfitz
============
*/
void Cvar_Reset_f (void)
{
	switch (Cmd_Argc())
	{
	default:
	case 1:
		Con_Printf ("reset <cvar> : reset cvar to default\n");
		break;
	case 2:
		Cvar_Reset (Cmd_Argv(1));
		break;
	}
}

/*
============
Cvar_ResetAll_f -- johnfitz
============
*/
void Cvar_ResetAll_f (void)
{
	cvar_t	*var;

	for (var = cvar_vars; var; var = var->next)
    {
		Cvar_Reset (var->name);
	}
}
